Motor protection breaker, 0.25 A, CLASS 10, spring terminals
The Siemens SIRIUS 3RV2011-0CA25-ZX95 is a motor protection circuit breaker in size S00, designed for three-phase motor branch circuits. Its thermal overload release is adjustable from 0.18 to 0.25 A, and the magnetic short-circuit release trips instantaneously at 3.3 A. The CLASS 10 trip class means it will disconnect within 10 seconds at 7.2× the set current — fast enough to protect standard IEC induction motors during a locked-rotor event without nuisance tripping on normal starts. Breaking capacity is a flat 100 kA across the full voltage range: 240 V, 400 V, 500 V, and 690 V AC. That SCCR (short-circuit current rating) lets you coordinate downstream contactors and overloads without adding a separate fuse or upstream breaker, provided the available fault current stays under 100 kA at the panel. Termination is spring-type (cage clamp) on the main circuit, accepting 2× (0.5 to 4 mm²) solid or stranded. The unit includes factory-fitted transverse auxiliary contacts: 1 NO + 1 NC, rated for 100,000 mechanical/electrical operations. Snap-on mounting onto 35 mm DIN rail per EN 60715, any orientation.
Sourcing and lifecycle
RoHS compliance date is noted as 10/01/2009, meaning the design meets EU Directive 2002/95/EC. No separate UL or CSA listing appears in the spec record, but the SIRIUS range typically carries IEC/EN 60947-2 and 60947-4-1 approvals; verify the specific certification mark on the unit if your panel requires UL 508 listing.
Panel integration and fit
Size S00 footprint: 45 mm wide, 97 mm deep, 106 mm tall (with handle). Snap-on DIN rail mounting, no tools needed. Side-by-side mounting requires 30 mm clearance to adjacent devices for heat dissipation; zero clearance when using the side-by-side arrangement with the same S00 frame. The spring terminals accept ferruled or solid conductors — strip length is 8 mm for the cage clamp. The breaker integrates directly with SIRIUS contactors in sizes S00 and S0 via a screwless bus bar system, forming a compact motor starter assembly. The handle provides a visible break position and can be padlocked in the OFF position for lockout/tagout.